Error with send_media_group when uploading video in Telegram bot

I’m having trouble with my Telegram bot when trying to upload a video file along with a custom thumbnail. The bot throws an error saying media not found when parsing the input media.

I’m working with Python 3.11.6 and using python-telegram-bot v20.7 library. The error message I keep getting is:

Can't parse inputmedia: media not found

Here’s my current implementation:

file_video = InputFile(video_file_path)
thumb_file = InputFile(thumb_file_path) if thumb_file_path else None
print(thumb_file_path)
video_media = InputMediaVideo(media=file_video, thumbnail=thumb_file)
print("Checkpoint 1")
await telegram_bot.send_media_group(chat_id=channel_id, media=[video_media])
print("Checkpoint 2")

The console shows the correct paths for both video and thumbnail files, and “Checkpoint 1” gets printed successfully, but the process fails before reaching “Checkpoint 2”.

What could be causing this parsing error? Any suggestions on how to fix this issue would be really helpful.

Had the same issue recently. The problem is how InputFile objects get handled with send_media_group - the library can’t manage file references properly sometimes. I fixed it by using file paths directly instead of wrapping them in InputFile objects. Try this: video_media = InputMediaVideo(media=open(video_file_path, ‘rb’), thumbnail=open(thumb_file_path, ‘rb’) if thumb_file_path else None) await telegram_bot.send_media_group(chat_id=channel_id, media=[video_media]). You can also just pass file paths as strings to the media parameter - the library handles file opening internally. This fixed my parsing error with the same setup.

The Problem:

Estás teniendo problemas al subir videos con miniaturas personalizadas a tu bot de Telegram. Tu código utiliza la librería python-telegram-bot v20.7 y genera el error Can't parse inputmedia: media not found. El código llega al “Checkpoint 1” pero falla antes del “Checkpoint 2”, indicando un problema con el procesamiento de InputMediaVideo.

:thinking: Understanding the “Why” (The Root Cause):

El problema radica en cómo la librería python-telegram-bot maneja los objetos InputFile y InputMediaVideo, especialmente en la versión 20.7. Parece que hay una inconsistencia en cómo se procesan los objetos InputFile cuando se usan tanto para el video como para la miniatura dentro de InputMediaVideo. Versiones anteriores o un manejo diferente de los archivos podría resolver este problema. La librería podría tener problemas al referenciar correctamente los archivos, especialmente cuando se usan objetos InputFile. Usar directamente las rutas de los archivos en lugar de envolverlos en objetos InputFile puede solucionar el conflicto.

:gear: Step-by-Step Guide:

Paso 1: Usar rutas de archivos directamente. En lugar de usar objetos InputFile, intenta pasar directamente las rutas de tus archivos de video y miniatura al constructor de InputMediaVideo. Esto simplifica el proceso y evita posibles conflictos con la forma en que la librería maneja los objetos InputFile. Modifica tu código de la siguiente manera:

video_media = InputMediaVideo(media=video_file_path, thumbnail=thumb_file_path if thumb_file_path else None)
await telegram_bot.send_media_group(chat_id=channel_id, media=[video_media])

Paso 2: Verificar la existencia y permisos de los archivos. Antes de enviar el media group, asegúrate de que las rutas video_file_path y thumb_file_path sean correctas y que tu bot tenga los permisos necesarios para leer ambos archivos. Imprime las rutas en la consola para verificarlas y agrega manejo de excepciones para detectar si los archivos no existen o no se pueden leer.

Paso 3: Probar con diferentes versiones de la librería. Si el paso anterior no funciona, intenta bajar a una versión anterior de python-telegram-bot (por ejemplo, la 20.6). Las versiones más recientes de las librerías a veces introducen cambios que pueden causar incompatibilidades.

Paso 4: Verificar el formato de los archivos. Asegúrate de que tu archivo de video sea compatible con Telegram y que la miniatura tenga un formato soportado (JPEG, PNG, etc.).

:mag: Common Pitfalls & What to Check Next:

  • Tamaño del archivo: Telegram tiene límites de tamaño para archivos multimedia. Asegúrate de que tu video y miniatura estén dentro de estos límites.
  • Formato de archivo: Verifica que los formatos de video y miniatura sean compatibles con Telegram.
  • Permisos de archivo: Asegúrate de que tu bot tenga los permisos de lectura adecuados para los archivos de video y miniatura.
  • Librería actualizada: Asegúrate de tener la librería python-telegram-bot instalada correctamente y considera revisar si existen actualizaciones o soluciones en su repositorio de GitHub.

:speech_balloon: Still running into issues? Share your (sanitized) config files, the exact command you ran, and any other relevant details. The community is here to help!

sounds like a library version problem. I had the same issue with v20.7 - downgraded to v20.6 and it worked fine. Also try passing file paths as strings directly to InputMediaVideo instead of wrapping them in InputFile. the newer versions sometimes screw up file object handling.

This usually happens when your media gets corrupted on its way to Telegram’s servers. I’ve hit this exact problem before - it’s almost always file size or encoding issues, not the InputFile wrapper. Before you mess with your code, check if the video file itself is corrupted and verify you’re not hitting Telegram’s file size limits for media groups. Also, don’t reuse the same InputFile object multiple times - create a fresh one for each upload. If your file paths look good but it’s still failing to parse, try uploading just the video without any thumbnail first. That’ll tell you if it’s a video encoding problem or something wrong with thumbnail handling.

Yeah, this is super common with Telegram bot media handling. Skip the InputFile headaches and just automate the whole thing.

I’ve hit this same wall on multiple projects. Managing files, errors, and API weirdness manually gets old fast, especially at scale.

What actually works? Set up an automated flow that handles the Telegram API mess for you. Feed it your video and thumbnail files - it processes everything correctly and sends through Telegram without you touching InputFile stuff.

Automation gives you consistent error handling, proper file references, and you can bolt on retry logic, file validation, or batch processing whenever you need it.

You can also chain other services. Compress videos before sending, auto-generate thumbnails, log uploads to your database - whatever.

Stop debugging Python library quirks. Build reliable automated processes that just work. Check out https://latenode.com

Check your file paths and permissions first. I hit the same issue - it’s how the library processes thumbnails internally. Your library version has quirks with InputMediaVideo when both media and thumbnail are InputFile objects. Here’s what worked for me: keep the video as InputFile but handle the thumbnail differently. Try setting thumbnail to None temporarily and see if the video uploads without errors. If it works, you know it’s the thumbnail causing problems. Also check if your video format is actually supported. Some MP4 variants break parsing even with correct file paths. I had to re-encode one video because the metadata was screwing up media group creation.

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